/* ========================================
   One Commit a Day
   Shared Website Stylesheet
======================================== */

/* 1. Design Tokens */

:root {
    --color-bg: #faf9f6;
    --color-surface: #ffffff;
    --color-surface-soft: #f1f0eb;

    --color-text: #292d32;
    --color-text-muted: #687078;

    --color-primary: #527b68;
    --color-primary-dark: #3e624f;
    --color-primary-light: #e7efe9;

    --color-border: #e5e3dc;

    --font-main: -apple-system, BlinkMacSystemFont,
                 "Segoe UI", sans-serif;

    --content-width: 1080px;
    --reading-width: 760px;

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;

    --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.04);
}


/* 2. Global Reset */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    font-size: 16px;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-primary-dark);
}

h1, h2, h3 {
    line-height: 1.3;
    letter-spacing: -0.025em;
}

h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
}

h2 {
    font-size: clamp(1.7rem, 3vw, 2.2rem);
    margin-bottom: 1.25rem;
}

h3 {
    font-size: 1.15rem;
}

p {
    color: var(--color-text-muted);
}


/* 3. Navigation */

header {
    width: 100%;
    border-bottom: 1px solid var(--color-border);
    background: rgba(250, 249, 246, 0.95);
}

.navbar {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 1.1rem 1.5rem;

    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.logo {
    color: var(--color-text);
    font-weight: 700;
    font-size: 1.1rem;
    white-space: nowrap;
}

.nav-links {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.nav-links a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--color-primary);
}


/* 4. Main Layout */

main {
    width: 100%;
}

.section {
    max-width: var(--reading-width);
    margin: 0 auto;
    padding: 5rem 1.5rem;
}

.section > p {
    margin-bottom: 1rem;
}

.section > h2 {
    color: var(--color-text);
}


/* 5. Hero */

.hero {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 8rem 1.5rem 7rem;
    text-align: center;
}

.eyebrow {
    color: var(--color-primary);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 1.25rem;
}

.hero h1 {
    color: var(--color-text);
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    max-width: 680px;
    margin: 0 auto;
    font-size: 1.15rem;
}

.hero-message {
    margin-top: 2rem;
    color: var(--color-primary);
    font-weight: 650;
    font-size: 1.1rem;
    letter-spacing: 0.02em;
}

.hero-actions {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 2.5rem;
}


/* 6. Buttons */

.button {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: var(--radius-sm);

    background: var(--color-primary);
    color: #ffffff;

    font-weight: 600;
    font-size: 0.95rem;

    transition: background 0.2s ease,
                transform 0.2s ease;
}

.button:hover {
    background: var(--color-primary-dark);
    color: #ffffff;
    transform: translateY(-2px);
}

.button.secondary {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text);
}

.button.secondary:hover {
    background: var(--color-surface-soft);
}


/* 7. Daily Loop */

.highlight-section {
    max-width: 100%;
    background: var(--color-primary-light);
    text-align: center;
}

.highlight-section > p {
    max-width: 600px;
    margin: 0 auto;
}

.daily-loop {
    max-width: 850px;
    margin: 2.5rem auto 0;

    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;

    color: var(--color-primary-dark);
    font-weight: 650;
}

.daily-loop span:nth-child(even) {
    color: var(--color-primary);
    opacity: 0.6;
}


/* 8. Principles Grid */

.principles-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
    margin-top: 2rem;
}

.principle {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
}

.principle h3 {
    color: var(--color-primary-dark);
    margin-bottom: 0.75rem;
}

.principle p {
    font-size: 0.95rem;
}

.important-note {
    margin-top: 2rem;
    padding: 1.25rem 1.5rem;

    background: var(--color-surface-soft);
    border-left: 3px solid var(--color-primary);

    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.95rem;
}


/* 9. Explore Cards */

.explore-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
    margin-top: 2rem;
}

.explore-card {
    display: block;
    padding: 1.5rem;

    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);

    box-shadow: var(--shadow-card);

    transition: transform 0.2s ease,
                border-color 0.2s ease;
}

.explore-card:hover {
    transform: translateY(-3px);
    border-color: var(--color-primary);
}

.explore-card h3 {
    color: var(--color-primary-dark);
    margin-bottom: 0.75rem;
}

.explore-card p {
    font-size: 0.95rem;
}


/* 10. Closing Section */

.closing-section {
    padding: 5rem 1.5rem;
    text-align: center;
    background: var(--color-surface-soft);
}

.closing-section h2 {
    margin-bottom: 0.75rem;
}

.closing-section p {
    margin-bottom: 2rem;
}


/* 11. Footer */

footer {
    padding: 2.5rem 1.5rem;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

footer p {
    font-size: 0.85rem;
    margin-bottom: 0.4rem;
}


/* 12. Responsive Layout */

@media (max-width: 768px) {

    .navbar {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        justify-content: center;
        gap: 0.75rem 1.25rem;
    }

    .hero {
        padding: 5rem 1.5rem;
    }

    .section {
        padding: 3.5rem 1.5rem;
    }

    .principles-grid,
    .explore-grid {
        grid-template-columns: 1fr;
    }

    .daily-loop {
        max-width: 400px;
        gap: 0.75rem;
    }
}

@media (max-width: 480px) {

    body {
        font-size: 15px;
    }

    .nav-links {
        gap: 0.5rem 1rem;
    }

    .hero {
        padding: 4rem 1.25rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-actions .button {
        text-align: center;
    }

    .daily-loop {
        flex-direction: column;
        gap: 0.4rem;
    }

    .daily-loop span:nth-child(even) {
        transform: rotate(90deg);
    }
}


/* Getting Started */

.principle + .principle {
    margin-top: 1rem;
}

.principle ul {
    margin: 0.75rem 0 1rem 1.25rem;
    color: var(--color-text-muted);
}

.principle li {
    margin-bottom: 0.4rem;
}

.principle pre {
    margin: 1rem 0;
    padding: 1rem;
    overflow-x: auto;
    background: var(--color-surface-soft);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

.principle code {
    font-family: Consolas, monospace;
    font-size: 0.9em;
}


/* Calendar Example */
.calendar-example {
    overflow-x: auto;
    margin: 1.5rem 0 2.5rem;
}

.calendar-example table {
    width: 100%;
    table-layout: fixed;
    border-collapse: collapse;
    text-align: center;
}

.calendar-example th,
.calendar-example td {
    border: 1px solid var(--border-color);
    padding: 0.8rem 0.4rem;
}

.calendar-example th {
    font-weight: 600;
}

.calendar-example td {
    height: 3.5rem;
}

/* Calendar Indicators */
.calendar-indicators {
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.calendar-indicators h3 {
    margin-top: 0;
}